Emma Watson in Vintage YSL Suit and SUSI Studio 'Hey Simone' Sandals

Emma Watson took up an interest in sustainable fashion when she participated in the Green Carpet Challenge in 2015, and it looks like the concept stuck. The actress recently stopped by the Jimmy Kimmel Live! studios to promote her upcoming film “Beauty and the Beast” in yet another entirely sustainable look.

The 26-year-old actress and activist arrived wearing a slouchy vintage suit from Yves Saint Laurent, which was buttoned up, but still low-cut enough to show off a glimpse of a black lace bra underneath.

Emma Watson arriving at the ABC studios for an appearance on ‘Jimmy Kimmel Live!’ in Los Angeles, California, on March 7, 2017

Our final day of promoting @beautyandthebeast in Los Angeles. Less than a week until the film opens worldwide! 🇺🇸🌹 Suit is vintage @ysl. Every new item of clothing made has a substantial carbon footprint attached to its manufacturing; but the amount of new energy needed to produce vintage clothing is zero. Vintage clothing has a huge role to play in making fashion more sustainable and reducing a global footprint that includes the 132m metric tons of coal used yearly through the production of new fibres, dyeing and bleaching of garments and the 6-9 trillion litres of water used by the industry. The bespoke jumpsuit worn on @jimmykimmellive is by @galvanlondon. Galvan is an independent brand founded in 2014 by four women from the worlds of fashion and art who wanted to redefine modern evening wear. The jumpsuit was made by couture-trained pattern makers, using traditional methods in its atelier in Germany. Jewellery by @lauralombardi and @pippasmalljewellery. Laura Lombardi pieces are made by hand in New York City from new, recycled, and found materials. Social anthropologist and jeweller Pippa Small works directly with miners, craftspeople and gem traders all over the planet, not only to ensure ethical products, but also to share a direct connection of global beauty and world vision. Fashion info verified by @ecoage #ecoloves Skin prepped with Heritage Store Rosewater Glycerin Water. @rmsbeauty “Un” Cover Up was used as foundation with “Un” Powder to set. RMS Beauty is free from nanotechnology and GMO ingredients. Contouring is @tataharper Contour in Very Bronzing. Tata Harper runs her company in the belief that a company that makes products for women should be run by a woman. @vitaliberata Trystal Minerals Self-Tanning Bronzing was also used for contouring. Cheeks are Tata Harper Volumizing Lip and Cheek Tint in Very Sweet. Eyes and brow are @janeiredale Liquid Eyeliner in Brown and Pure Brow Gel in Clear. Beauty brands verified by @contentbeauty

A post shared by The Press Tour (@the_press_tour) on Mar 9, 2017 at 9:04am PST

Belle of the Ball || Here she is, the brave, the bold, the beautiful @emmawatson in our Hey Simone heels in black. We couldn’t be more ecstatic. We’re so grateful for everything she stands and fights for as a woman and human being. Thank you from the bottom of our hearts. We love you, Emma! (Reposting because this photo is heaps better.) . . . . . . . #vegan #vegansofig #veganlifestyle #veganshoes #vsco #vscocam #veganfashion #fashion #plantbased #susistudio #shoes #love #govegan #fashionblog #fashionblogger #veganism #sustainable #sustainability #ecofashion #eco #ecofriendly #sale #susi #emmawatson #beautyandthebeast

A post shared by SUSI Studio (@susistudio) on Mar 7, 2017 at 11:53am PST

Shoe of the Moment || Our Hey Simone mini heels are selling like hot cakes. We’re nearly sold out, so hurry on over! PS We’re hosting a sitewide sale to raise funds for Planned Parenthood, too! . . . . . . . #vegan #vegansofig #veganlifestyle #veganshoes #vsco #vscocam #veganfashion #fashion #plantbased #susistudio #shoes #love #govegan #fashionblog #fashionblogger #veganism #sustainable #sustainability #ecofashion #eco #ecofriendly #sale #susi

A post shared by SUSI Studio (@susistudio) on Mar 9, 2017 at 10:10am PST

For her guest stint, Emma changed into a bespoke jumpsuit from Galvan. The “Beauty and the Beast” star talked about her film and a famous “Harry Potter” outtake with host Jimmy Kimmel. She also discussed meeting Celine Dion and leaving books for commuters in her spare time.

Emma styled her outfit with red lips and a loose updo, and completed it with a pair of black ankle-strap sandals from vegan footwear brand SUSI Studio. She wore the “Hey Simone” heels, which she also wore at a press junket in Los Angeles.

If you want more sustainable fashion by Emma, you can follow along with her “Beauty and the Beast” tour Instagram account. The handle — The Press Tour — highlights each and every look she wears during promotions. Emma shares more information about the designers, creative process and materials for every look. She enlists the help of Exo-Age in order to verify every detail of every outfit.

So far, she’s worn outfits from Elie Saab, Phillip Lim, Cienne, Oscar de la Renta and Roland Mouret. One of our personal favorite looks was a bespoke Emilia Wickstead gown she wore for a London screening, and she even inspired a 3-year-old fan to recreate a custom Louis Vuitton look she wore for a Paris photo call.

The next day, Emma strolled through the Los Angeles International Airport in a white shirt and a green-and-black checkered miniskirt. Emma styled her casual-cool outfit with a black leather jacket from Stella McCartney and sunglasses from Krewe, and finished everything off with a pair of black leather lace-up boots from Dr. Martens.

Emma Watson at the Los Angeles International Airport in Los Angeles, California, on March 8, 2017

Emma wore the “1460” boots from Dr. Martens. These shoes featured smooth black leather, Goodyear welt construction and the brand’s signature yellow stitching. You can purchase them for $135 over at Dr. Martens. These boots are also available in green, cherry red, white and navy.

Dr. Martens “1460” Boots, $135

Credit: WENN/Michael Wright